Any item that is so good tasting that it will inspire a violent temper tantrum if not given or if taken away.

“Wow, I didn’t realize how tantrumlicious that kids toothpaste is!”

“Let’s not walk down that isle, there are too many tantrumlicious items down there”

“Okay, he can have one tantrumlicious item, but no more.”

“Since when are pomegranate seeds tantrumlicious?”

At the time of the writing of this post, there were zero google search results for “tantrumlicious”.  Hooray for new words!